now, john allen is under investigation. defense secretary leon pan eight said he ordered an investigation of general allen on monday. the secretary who is a former cia director also talking about general petraeus' resignation. he says, quote, i think he took the right step and i think it is important when you are director of the cia with all the challenges that fess you in that position that personal integrity comes first and foremost. general petraeus was scheduled to testify about the benghazi attacks. >> it is not a coincidence to me. he is the one who probably knows most about what happened or didn't happen there and if this is homing over his head when he went to go brief the united states senate, did that influence the way, the direction and the story he told? >> reporter: a pentagon official says 20,000 to 30,000 peoples of e-mails are now under review. >>> congress returns to work today with a long list of unfinished business. as we take a live look outside at capitol hill, none is more pressing than stopping the do